/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.antgroup.geaflow.dsl.rel;

import java.util.List;
import java.util.Objects;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.AbstractRelNode;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelWriter;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.commons.lang3.StringUtils;

public abstract class GraphScan extends AbstractRelNode {

    protected final RelOptTable table;

    protected GraphScan(RelOptCluster cluster, RelTraitSet traitSet, RelOptTable table) {
        super(cluster, traitSet);
        this.table = Objects.requireNonNull(table);
    }

    @Override
    public RelOptTable getTable() {
        return table;
    }

    @Override
    protected RelDataType deriveRowType() {
        return table.getRowType();
    }

    @Override public RelWriter explainTerms(RelWriter pw) {
        return super.explainTerms(pw)
            .item("table", StringUtils.join(table.getQualifiedName(), "."));
    }

    public abstract GraphScan copy(RelTraitSet traitSet, RelOptTable table);

    public GraphScan copy(RelTraitSet traitSet, List<RelNode> inputs) {
        assert inputs.isEmpty();
        return copy(traitSet, table);
    }
}
